Add normalizeChapterSortOrder method to ensure sequential 1-based sort_order values. Update reorderChapter to normalize before reordering and validate new position against chapter count. Call normalization after chapter deletion to fill gaps in remaining chapters.
Add normalizeLessonSortOrder method to ensure sequential 1-based sort_order values. Update reorderLesson to normalize before reordering and validate new position against lesson count. Call normalization after lesson deletion to fill gaps in remaining lessons.
Add normalizeQuestionSortOrder method to ensure sequential 1-based sort_order values. Update reorderQuestion to normalize before reordering and validate new position against question count. Call normalization after question deletion to fill gaps in remaining questions.
Remove validation that prevented deletion of published lessons. Lessons can now be deleted regardless of their published status without requiring unpublishing first.
Add is_skippable boolean field to Quiz schema, update quiz creation and update logic to handle the new field, and include it in student course content responses. Update seed data and type definitions accordingly.
